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EM(4) FreeBSD Kernel Interfaces Manual EM(4)
NAMEem -- Intel(R) PRO/1000 gigabit Ethernet driver for the FreeBSD operating
system
SYNOPSISdeviceemDESCRIPTION
The em driver provides support for PCI gigabit Ethernet adapters based on
the Intel 82540, 82542, 82543, 82544 and 82546 Ethernet controller chips.
The driver supports Transmit/Receive checksum offload and Jumbo Frames
only on 82540, 82543, 82544 and 82546-based adapters. For a list of sup-
ported adapters, see the README included with the driver.
For questions related to hardware requirements, refer to the documenta-
tion supplied with your Intel PRO/1000 adapter. All hardware require-
ments listed apply to use with FreeBSD.
Support for Jumbo Frames is provided via the interface MTU setting.
Selecting an MTU larger than 1500 bytes with the ifconfig(8) utility con-
figures the adapter to receive and transmit Jumbo Frames. The maximum
MTU size for Jumbo Frames is 16114.
This driver version supports VLANs. For information on enabling VLANs,
see the README. The em driver supports the following media types:
autoselect Enables auto-negotiation for speed and duplex.
10baseT/UTP Sets 10Mbps operation. Use the mediaopt option to select
full-duplex mode.
100baseTX Sets 100Mbps operation. Use the mediaopt option to select
full-duplex mode.
1000baseSX Sets 1000Mbps operation. Only full-duplex mode is supported
at this speed.
1000baseTX Sets 1000Mbps operation. Only full-duplex mode is supported
at this speed.
The em driver supports the following media options:
full-duplex Forces full-duplex operation
half-duplex Forces half-duplex operation.
Only use mediaopt to set the driver to full-duplex. If mediaopt is not
specified, the driver defaults to half-duplex.
For more information on configuring this device, see ifconfig(8).
DIAGNOSTICSem%d:Unabletoallocatebusresource:memory A fatal initialization
error has occurred.
em%d:Unabletoallocatebusresource:interrupt A fatal initialization
error has occurred.
em%d:watchdogtimeout--resetting The device has stopped responding to
the network, or there is a problem with the network connection (cable).
SUPPORT
For additional information regarding building and installation, see the
README included with the driver. For general information and support, go
to the Intel support website at: http://support.intel.com.
If an issue is identified with the released source code on the supported
kernel with a supported adapter, email the specific information related
to the issue to <freebsdnic@mailbox.intel.com>.
SEE ALSOarp(4), gx(4), netintro(4), ng_ether(4), vlan(4), ifconfig(8)HISTORY
The em device driver first appeared in FreeBSD 4.4.
AUTHORS
The em driver was written by Intel Corporation
<freebsdnic@mailbox.intel.com>.
FreeBSD 10.1 July 26, 2002 FreeBSD 10.1